merge_trees() took a results parameter that would only be written when
opt->call_depth was positive, which is never the case now that
merge_trees_internal() has been split from merge_trees(). Remove the
misleading and unused parameter from merge_trees().
While at it, add some comments explaining how the output of
merge_trees() and merge_recursive() differ.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
builtin/checkout.c | 4 +---
merge-recursive.c | 6 +++---
merge-recursive.h | 20 ++++++++++++++++----
sequencer.c | 4 ++--
4 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 91f8509f85..20e38c5edc 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -708,7 +708,6 @@ static int merge_working_tree(const struct checkout_opts *opts,
* give up or do a real merge, depending on
* whether the merge flag was used.
*/
- struct tree *result;
struct tree *work;
struct tree *old_tree;
struct merge_options o;
@@ -773,8 +772,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
ret = merge_trees(&o,
new_tree,
work,
- old_tree,
- &result);
+ old_tree);
if (ret < 0)
exit(128);
ret = reset_tree(new_tree,
diff --git a/merge-recursive.c b/merge-recursive.c
index f5cf21e2e0..4a481c3929 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3613,14 +3613,14 @@ static void merge_finalize(struct merge_options *opt)
int merge_trees(struct merge_options *opt,
struct tree *head,
struct tree *merge,
- struct tree *common,
- struct tree **result)
+ struct tree *common)
{
int clean;
+ struct tree *ignored;
if (merge_start(opt, head))
return -1;
- clean = merge_trees_internal(opt, head, merge, common, result);
+ clean = merge_trees_internal(opt, head, merge, common, &ignored);
merge_finalize(opt);
return clean;
diff --git a/merge-recursive.h b/merge-recursive.h
index c2b7bb65c6..812c456f1b 100644
--- a/merge-recursive.h
+++ b/merge-recursive.h
@@ -70,19 +70,31 @@ static inline int merge_detect_rename(struct merge_options *o)
o->diff_detect_rename >= 0 ? o->diff_detect_rename : 1;
}
-/* merge_trees() but with recursive ancestor consolidation */
+/*
+ * merge_recursive is like merge_trees() but with recursive ancestor
+ * consolidation, and when successful, it creates an actual commit
+ * and writes its address to *result.
+ *
+ * NOTE: empirically, about a decade ago it was determined that with more
+ * than two merge bases, optimal behavior was found when the
+ * ancestors were passed in the order of oldest merge base to newest
+ * one. Also, ancestors will be consumed (emptied) so make a copy if
+ * you need it.
+ */
int merge_recursive(struct merge_options *o,
struct commit *h1,
struct commit *h2,
struct commit_list *ancestors,
struct commit **result);
-/* rename-detecting three-way merge, no recursion */
+/*
+ * rename-detecting three-way merge, no recursion; result of merge is written
+ * to opt->repo->index.
+ */
int merge_trees(struct merge_options *o,
struct tree *head,
struct tree *merge,
- struct tree *common,
- struct tree **result);
+ struct tree *common);
/*
* "git-merge-recursive" can be fed trees; wrap them into
diff --git a/sequencer.c b/sequencer.c
index 34ebf8ed94..c4ed30f1b4 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -586,7 +586,7 @@ static int do_recursive_merge(struct repository *r,
struct replay_opts *opts)
{
struct merge_options o;
- struct tree *result, *next_tree, *base_tree, *head_tree;
+ struct tree *next_tree, *base_tree, *head_tree;
int clean;
char **xopt;
struct lock_file index_lock = LOCK_INIT;
@@ -613,7 +613,7 @@ static int do_recursive_merge(struct repository *r,
clean = merge_trees(&o,
head_tree,
- next_tree, base_tree, &result);
+ next_tree, base_tree);
if (is_rebase_i(opts) && clean <= 0)
fputs(o.obuf.buf, stdout);
strbuf_release(&o.obuf);
--
2.22.0.550.g71c37a0928.dirty
